Dyeing skins or pelts



Patented Oct. 5, 1937 UNITED STATES 2,095,070 DYEING sxnvs on PELTS Erich Lehman'n, Priorau, Kreis Bitterfeld, Germany, assignor to General Aniline Works, Inc., New York. N. Y.,' a corporation oi Delaware I No Drawing. Application January 8, 1937; Serial No. 119,587.. In Germany January 24, 1936 I 6 Claims.

The present invention relates to a new process for dyeing skins and pelts.

In my copending application Serial No. 741,876

I have disclosed a. process for dyeing pelts and hairs by treating these materials in a bath containing an oxidizing agent and a salt-like compound of the general formula wherein Ris inter alia a polyhydroxy compound 'of the naphthalene series and R is an unsubstituted or substituted aminophenyl radicle, these compounds being used if necessary in the presenceof a dispersing agent for the purpose of bringing substances of the said lgind which are sparingly, soluble in water into the desired fine state of distribution. I. it 1 Now I have found that th likeeffect saltlike compounds may be' used hich correspond to the general formula z 0H-H:NR i

wherein a: is H or OH, 1! is vhalogen, nitro, aceto and halogenaceto and R means an aromatic or 30, heterocyclic base.

With the help of capillary active substances the sparingly'water-soluble salts of this kind may be used as dyestuffs for pelts and there are obtained by this means beautiful and strong tints 01' good fastness.

The following examples illustrate the invention, the parts being by weight:-

Example 1.--2 parts of the mixture consisting of parts of the salt made from 4-aceto-1.2-

40 dihydroxybenzene and 4-amin'odiphenylamine and 60 parts of a dispersing agent made as described in German specification No.. 436,881 by condensation of a. naphthalene sulfonic acid with benzylchloride, are dissolved in 1000 parts of water and the solution is mixed with 10 parts of hydrogen peroxide of 3 per cent. strength. A white rabbit skin previously prepared with chromium salt which is dyed in this bath for 3 hours at a temperature of 30 C. acquires a green-gray tint which has good fastness to light.

Example 2.2 parts of a mixture consisting of 40 parts of the salt made from 8-aminoquinoline and 4-ch1oro-1.2-dihydroxybenzene and parts of the wetting agent mentioned in Exam- 56 pie 1, are dissolved in 1000 parts of water and thesolution is mixed with 10 parts'o'f hydrogen peroxide solution of 3 per cent. strength. A white lamb skin'pre-treated with potassium bichromate is dyed in this bath for 3 hours-at 30 C. whereby a clear reddish brown is obtained. 5 I

v Example 3.--2 parts of a mixture conflsting of 40 parts of the salts made from 4-nitro-l.3- dihydroxybenzene and -4-nitro-1.3-diaminobenzene and 60 parts of isopropylnaphthalene sulfonic acid are dissolved in 1000 parts of water 10 and the solution is mixed with 10 parts of a hydrogen peroxide solution of '3 percent. strength. A white rabbit skin pre-t'reated with an iron mordant is dyed by this dye under conditions the same as described in Example 2 a clear green 15 yellow. J 1. I

Example 4.2 parts'of a mixture consisting of 40 parts of'the salt made from 5-nit'ro- 1.2.4-

,trihydroxybenzene and 2.4-diaminotoluene and 60 parts of- Turkey red oil'are dissolved in 1000 parts or water and the soluti'onis mixed with 10 parts of hydrogen peroxide solution of 2, per cent. strength, A white lamb skin pre-treated with a chromium mordant is dyed green-brown by this bath. 5 25 Example 5.-2 parts of a mixture consisting of 40 parts of the salt from 1.5-diaminonaphthalene and 4-trichloraceto-l.2-dihydroxybenzene and 60 parts of isopropylnaphthalene sulfonic acid'are dissolved in water and the solution is mixed with -10 parts of a'hydrogen peroxide solution of 3 per cent. strength. .A white rabbit skin pre-treated with a chromium mordant is dyeda i'ull bluish gray tint in this bath.

Example 6.-2 parts of a mixture consisting 35 of 40 parts of the salt made from 4-bromo-1.2.6- trihydroxybenzene and 2-chloro-L4-diaminobenzene and 60 parts of Turkey red oil are dissolved in 1000 parts of water and the solution is mixed. with 10 parts of a hydrogen peroxide solution of I 40 3 per cent. strength, A white lamb skin previously treated with an iron mordant is dyed a as, for instance, sulfonated hydrocarbons from brown coal tar, sulfonated solar oil, water-soluble condensation products of unsaturated fatty acids with sulfonic acids of aromatic compounds,

aliphatic alcohol sulfonates or the'like, may be used for dissolving or dispersing the salt-like products in question. In the examples I have compounds containing other basic components and generally this basic substituent may be a 1.3-

or 1.4-diaminobenzene unsubstituted or substihalogen nitro apeto halogenoaceto and e tuted in the nucleus or in one of-the NH: groups,

furthermore, it may be 1.4-, 1.5-; 2 .4-,' 2.7-di- A aminon'aphthalene, benzidine and their deriv'a- 1 tives. From the heterocyclic series I enumerate 8-amin0quino1ine, 8-amlnoquinaldine, 5.8-di-.

aminoquinoline and 3-aminocarbazole.

What I claim is:-g Y

1. The process for dyeing skins and peltswhic'h comprisestreating the said materials injabath containing an oxidizing agent, a dispersing agent 50 wherein y is a member of the group consisting of I and a salt-like compound of the general formula V a g. OR

wherein :r is a member of the g'roup'consi sting of H and OH, y isfa member of the group'consisting of -halogen,nitro, aceto'and halogenoaceto, andR means thefradi'clefof a baseoi' the group consisting of aminobenzenes, aminonaphthalenes and heterocyclic bases,

2. The process for dyeing skins and pelts which 1 comprises treating the said materials in a'bath containing an oxidizing agent, a 'dispersingjagent anda'saltflike'compound of the general formula aminonaphthalenes I 3. The process for dyeing skins and pelts which comprises treating the said materials in a bath containing an oxidizing agent, a dispersing agent 7 and a salt-like compound of the general formula oil-Him;

wherein 1 is a member of the group consisting of means theradiclelof a base of the group consist- "ing of aminobenzenes, aminonaphthalenes and V heterocyclic bases. g

' 4; The process for'dyeing skins and pelts which comprises treating the said materials in a bath containing an oxidizing agent, a dispersing agent landa salt-like compound of the formula INO1" m 5. The process for dyeing skins and pelts which comprises treatingthe said materials .in a bath containing an oxidizing'ag'ent, a dispersingagent 'and'a salt-like compound oflthe formula 6. The process for dyeing skins and pelts which comprises treating the said materials in a bath containing an oxidizing agent, a dispersing agent and a salt-like compound of the formula co-0H. V ERICHVLEHMANN. 

